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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Mortgage loans held for sale | $ 2,519,900,000 | $ 2,386,000,000 |
Mortgage servicing rights | 11,100,000 | 10,600,000 |
Loans Receivable [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 2,600,000 | (700,000) |
Purchases | 0 | 0 |
Sales and Settlements | (14,800,000) | (3,900,000) |
Principal Reductions | 0 | 0 |
Net transfers to (out of) Level 3 | 9,700,000 | 7,000,000 |
Contractual Rights |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 200,000 | (1,200,000) |
Purchases | 52,400,000 | 35,300,000 |
Sales and Settlements | (52,100,000) | (27,600,000) |
Principal Reductions | 0 | 0 |
Net transfers to (out of) Level 3 | 0 | 0 |
Derivative Financial Instruments, Assets | Derivative Financial Instruments, Liabilities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 104,200,000 | (153,000,000.0) |
Purchases | 0 | 0 |
Sales and Settlements | 0 | 0 |
Principal Reductions | 0 | 0 |
Net transfers to (out of) Level 3 | 0 | 0 |
Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Mortgage loans held for sale | 11,600,000 | 14,100,000 | $ 11,700,000
Mortgage servicing rights | 11,100,000 | 10,600,000 | 4,100,000
Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Commitments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | (31,600,000) | $ (135,800,000) | $ 17,200,000
Measurement Input, Prepayment Rate [Member] | Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.10 |  |
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.11 |  |
Measurement Input, Default Rate [Member] | Level 3 [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | $ 0.08 |  |

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481852/948-310-45-1 + Details
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